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Home/ Questions/Q 62417
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Editorial Team
Asked: May 10, 20262026-05-10T18:28:22+00:00 2026-05-10T18:28:22+00:00

I don’t understand it. The ids of html elements in the master page are

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I don’t understand it.

The ids of html elements in the master page are changed by the same id but with a prefix and it’s breaking the css design.

In the master page I have:

<div id='container' runat='server'>      <asp:ContentPlaceHolder ...  ... 

The above code is rendered

<div id='ctl00_ctloo_container'>       ... 

And the CSS styles are gone obviously.

How do I stop it?

Thanks!

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  1. 2026-05-10T18:28:22+00:00Added an answer on May 10, 2026 at 6:28 pm

    WebForms should only rewrite the ID’s of server controls (like <asp:ContentPlaceHolder />, not ordinary HTML element like <div id='container'> without runat='server'

    You cannot prevent the framework from rewriting ID’s on server controls. You can use class names instead, though.

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